<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<div id="box">
			heihei
		</div>
	</body>
</html>
<!-- 1.本地导入 -->
<!-- <script src="jQuery.js"></script> -->
<!-- 2.远程cdn导入jQuery文件 -->
<script src="http://code.jquery.com/jquery-2.1.1.min.js"></script>
<script>
	console.log($("#box").html());
</script>